Whenever I load into the map, the sky is missing and has the "repeater" effect, at which the game then freezes for a few moments, before crashing and closing the game, sending me back to my desktop. Is the map broken in general or for me? And if it is me, how would I fix it?

I don't think it's just you as I had the same problem. I'm not sure if it was fixed as I'm using a newer PC now and haven't yet re-installed Nightfire Source, but I think the map was removed from a newer version of the game I'm not sure though.

I hope that helps a bit,

CBMI6.

"Coffee...the finest organic suspension ever devised" - Kathryn Janeway. Or in Nightfire's case, in a polystyrene cup with a straw!

I believe dm_colonyhotel was a port from another game. The map is broken in the original Nightfire and don't believe it was in Nightfire Source.
I can't recall it for sure, but I believe the same author also created dm_mousekitchen. Maybe worth checking out..